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Due to the processes of plate tectonics, new oceanic crust is in a constant cycle of production and destruction. The cycle of creation to destruction occurs in roughly 200 million year intervals--not a huge span in geologic time. The ocean floor is therefore composed of basaltic rock that ranges in age from brand new to 200 million years old. Continental rock is generally a great deal older; some formations are over 4 billion years in age.

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